[android] Support other elements than Path as href in TextPath

android/src/main/java/com/horcrux/svg/TSpanShadowNode.java

@@ -102,7 +102,7 @@ class TSpanShadowNode extends TextShadowNode {
         boolean isClosed = false;
         final boolean hasTextPath = textPath != null;
         if (hasTextPath) {
-            pm = new PathMeasure(textPath.getPath(), false);
+            pm = new PathMeasure(textPath.getTextPath(canvas, paint), false);
             pathLength = pm.getLength();
             isClosed = pm.isClosed();
             if (pathLength == 0) {

android/src/main/java/com/horcrux/svg/TextLayoutAlgorithm.java

@@ -987,7 +987,7 @@ public class TextLayoutAlgorithm {
 */
             final TextPathShadowNode textPathShadowNode = inTextPath.get(index);
             if (textPathShadowNode != null && result[index].addressable) {
-                textPath = textPathShadowNode.getPath();
+                textPath = textPathShadowNode.getTextPath(null, null);
                 inPath = true;
 /*
 

android/src/main/java/com/horcrux/svg/TextPathShadowNode.java

@@ -92,17 +92,17 @@ class TextPathShadowNode extends TextShadowNode {
         drawGroup(canvas, paint, opacity);
     }
 
-    public Path getPath() {
+    public Path getTextPath(Canvas canvas, Paint paint) {
         SvgViewShadowNode svg = getSvgShadowNode();
         VirtualNode template = svg.getDefinedTemplate(mHref);
 
-        if (template == null || template.getClass() != PathShadowNode.class) {
+        if (template == null || !(template instanceof RenderableShadowNode)) {
             // warning about this.
             return null;
         }
 
-        PathShadowNode path = (PathShadowNode)template;
-        return path.getPath();
+        RenderableShadowNode shadowNode = (RenderableShadowNode)template;
+        return shadowNode.getPath(canvas, paint);
     }
 
     @Override